| 100% | POSITRONS | 9 | Subatomic particles with the same mass as electrons |
| 68% | POSITRON | 8 | Elementary particle of antimatter with the same mass as an electron, but a positive charge |
| 54% | MUON | 4 | Subatomic particle with greater mass than an electron |
| 49% | MUON | 4 | Subatomic particle similar to, but with a much greater mass than, an electron |
| 44% | NEUTRINO | 8 | Subatomic particle with a mass close to zero |
| 43% | ISOMER | 6 | Molecule with the same chemical formula as another |
| 42% | AMINOR | 6 | Key with the same key signature as C major |
| 42% | ORCA | 4 | Whale with the same color scheme as a crossword |
| 42% | NAMESAKE | 8 | Person with the same moniker as another |
| 42% | EISNER | 6 | Former executive with the same interior letters as his company |
| 42% | ALTO | 4 | Any woman with the same vocal range as Judy Garland |
| 42% | OUNCE | 5 | Unit of measure with the same Latin origin as "inch" |
| 42% | ARUBA | 5 | Caribbean island with the same final three letters as another |
| 42% | SYNONYM | 7 | Word with the same meaning as another word |
| 42% | YUAN | 4 | Coin with the same name as a dynasty |
| 41% | MUONS | 5 | Particles with mass about 200 times that of electrons |
| 41% | TRACY | 5 | "30 Rock" character with the same first name as its actor |
| 41% | OBAMA | 5 | President with the same first and last name as his father |
| 41% | FOUR | 4 | Only number with the same number of letters as its value |
| 41% | IKEA | 4 | Store with the same colors as the Swedish flag |
| 41% | TWEED | 5 | Fabric with the same name as a Scottish river |
| 41% | PANAMA | 6 | Country with the same name as its capital, __ City |
| 41% | DELTA | 5 | Airline with the same name as a Greek letter |
| 41% | CROISSANT | 9 | Pastry with the same shape as an Argentine medialuna |
| 41% | NEUTRINO | 8 | A subatomic particle with virtually no mass |
| 41% | HAIKU | 5 | Bit of poetry with the same syllable count as this very clue |
| 41% | HERCULES | 8 | Beetle with the same name as a Roman divine hero |
| 41% | ASPENS | 6 | Trees with the same name as a Colorado ski resort |
| 40% | ENTER | 5 | Computer key with the same function as "Return" |
| 40% | MAFIA | 5 | Party game with the same rules as Werewolf |